Pulse Reviews and Analysis
Top 10 Reef Sump Designs for Refugium Filtering
Curated by Kory White · Fractional CRO, CRO SyndicateDirect Answer
The Triton V2 Sump by Reef Octopus is the #1 pick for refugium filtering, offering a dedicated refugium chamber with adjustable flow, a built-in algae scrubber port, and a footprint that fits most standard stands. For a runner-up, the Trigger Systems Sapphire 34 provides excellent value with a large refugium section and a dual-drain design at a lower price point.
This list is for professional reef operators who need reliable, high-flow sumps with optimized refugium integration for nutrient export and pod cultivation.
How We Ranked These
We evaluated sumps based on refugium volume (minimum 10% of total system volume), flow control (adjustable input/output to prevent detritus buildup), material quality (cast acrylic vs. Glass with siliconed seams), ease of maintenance (access to chambers, sockless options), and compatibility with standard 1-inch bulkheads and PVC plumbing (Sch 40 or 80).
We also considered real-world user reports from forums like Reef2Reef and manufacturer specs from 2025–2027 catalogs, prioritizing sumps that support chaetomorpha growth and copepod refuges without sacrificing skimmer or return pump space. Prices are based on 2027 retail averages.
1. Reef Octopus Triton V2 Sump 🏆 BEST OVERALL
The Triton V2 is a cast acrylic sump designed for triton method systems, featuring a dedicated refugium chamber with a built-in algae scrubber port. It measures 36" x 16" x 16" for a 100-gallon system, with a refugium volume of 8 gallons. The adjustable weir allows precise flow rate control (300–600 GPH) to prevent chaeto from tumbling into the skimmer section.
The dual-drain input supports Herbie or BeanAnimal overflow setups. At $799.99 (2027 MSRP), it’s a premium pick for operators running ULNS (ultra-low nutrient systems). Use it with a Reef Octopus Classic 150 skimmer and a Sicce Syncra 3.0 return pump for optimal nutrient export.
2. Trigger Systems Sapphire 34 💎 BEST VALUE
The Sapphire 34 is a glass sump with a silicone-sealed refugium section, offering 10 gallons of refugium volume in a 34" x 14" x 16" footprint. It features a sockless design with a filter roller compartment (compatible with Trigger Systems Roller Mat), reducing maintenance.
The adjustable baffle lets you control water level in the refugium, critical for macroalgae growth. At $549.99, it’s a budget-friendly option for operators with 75–90 gallon tanks. The dual-drain input uses 1-inch bulkheads and works with PVC plumbing.
Pair it with a Tunze 9004 skimmer for a cost-effective setup.
3. Fiji Cube Advanced Sump 36
The Fiji Cube Advanced Sump is a cast acrylic unit with a dedicated refugium chamber that uses a reverse-flow design to maximize contact time with chaetomorpha. It measures 36" x 18" x 16", with a refugium volume of 12 gallons. The adjustable gate valve on the return line allows fine-tuned flow (200–500 GPH) to the refugium, preventing detritus accumulation.
The dual-sock filter holder (included) can be swapped for a filter roller from Fiji Cube. At $899.99, it’s ideal for high-biomass systems like SPS tanks. Use it with a Reef Octopus Elite 200 skimmer and a Jebao DCP-8000 return pump.
4. Alignment Reef Shadow 34
The Shadow 34 is a glass sump with a black silicone seal, designed for low-profile stands (16" height). It includes a refugium chamber that uses a flow-through partition to direct nutrient-rich water through chaeto. The adjustable weir allows flow rate control up to 400 GPH.
The sockless design uses a filter pad tray for mechanical filtration. At $649.99, it’s a space-saving option for operators with rimless tanks. The dual-drain input is 1-inch and works with PVC plumbing.
Pair it with a Bubble Magus Curve 7 skimmer and a Sicce Syncra 2.0 return pump.
5. Bashsea Bio-Fuge 30
The Bashsea Bio-Fuge 30 is a custom acrylic sump with a bio-block chamber that integrates a refugium and biological filtration in one unit. It measures 30" x 15" x 15", with a refugium volume of 6 gallons. The adjustable flow diverter sends water through marine pure blocks before entering the chaeto section, enhancing denitrification.
At $749.99, it’s a specialized option for operators with heavy bioloads (e.g., predator tanks). The dual-drain input uses 1.5-inch bulkheads for high-flow systems. Use it with a Reef Octopus Classic 200 skimmer and a Jebao DCT-12000 return pump.
6. Eshopps R-200 Refugium Sump
The Eshopps R-200 is a glass sump with a silicone-sealed refugium section, offering 8 gallons of refugium volume in a 24" x 12" x 16" footprint. It features a sockless design with a filter pad tray and an adjustable baffle for water level control.
The single-drain input uses a 1-inch bulkhead and a gate valve for flow regulation (200–400 GPH). At $399.99, it’s a budget-friendly pick for nano systems (40–60 gallons). The refugium chamber is lit by a Kessil H80 or AI Prime Fuge.
Pair it with a Tunze 9001 skimmer for a compact setup.
7. Reef Savvy Sump 40
The Reef Savvy Sump 40 is a custom acrylic sump with a dedicated refugium chamber that uses a reverse-flow design to maximize pod production. It measures 40" x 18" x 16", with a refugium volume of 15 gallons. The adjustable weir allows flow rate control up to 600 GPH, and the dual-drain input supports Herbie overflows.
At $1,199.99, it’s a premium option for large systems (150+ gallons). The refugium section includes a built-in chaeto reactor port. Use it with a Reef Octopus Elite 250 skimmer and a Sicce Syncra 5.0 return pump.
8. Trigger Systems Ruby 36
The Ruby 36 is a glass sump with a silicone-sealed refugium section, offering 12 gallons of refugium volume in a 36" x 15" x 16" footprint. It features a sockless design with a filter roller compartment (compatible with Trigger Systems Roller Mat) and an adjustable baffle for water level control.
The dual-drain input uses 1-inch bulkheads and a gate valve for flow regulation (300–500 GPH). At $699.99, it’s a mid-range option for mixed reef tanks (90–120 gallons). The refugium chamber is lit by a AI Prime Fuge or Kessil H160.
Pair it with a Bubble Magus Curve 9 skimmer and a Jebao DCP-6000 return pump.
9. Fiji Cube Refugium Sump 24
The Fiji Cube Refugium Sump 24 is a cast acrylic sump with a dedicated refugium chamber that uses a flow-through partition to direct nutrient-rich water through chaetomorpha. It measures 24" x 12" x 16", with a refugium volume of 5 gallons. The adjustable gate valve on the return line allows fine-tuned flow (150–300 GPH).
The dual-sock filter holder (included) can be swapped for a filter roller from Fiji Cube. At $549.99, it’s a compact option for nano systems (30–50 gallons). The refugium chamber is lit by a Kessil H80 or AI Prime Fuge.
Pair it with a Tunze 9001 skimmer and a Sicce Syncra 1.5 return pump.
10. Bashsea Classic 24 Refugium Sump
The Bashsea Classic 24 is a custom acrylic sump with a refugium chamber that uses a flow-through design with adjustable baffles for water level control. It measures 24" x 12" x 15", with a refugium volume of 4 gallons. The single-drain input uses a 1-inch bulkhead and a gate valve for flow regulation (100–300 GPH).
At $449.99, it’s a budget-friendly pick for small systems (20–40 gallons). The refugium chamber is lit by a Kessil H80 or AI Prime Fuge. Use it with a Tunze 9001 skimmer and a Jebao DCP-3000 return pump.
FAQ
What is the ideal refugium volume for a 100-gallon system? Aim for 10–15 gallons (10–15% of total volume) to support chaetomorpha growth and copepod populations. The Reef Octopus Triton V2 offers 8 gallons, while the Reef Savvy Sump 40 provides 15 gallons.
Can I use a filter roller with a refugium sump? Yes, many sumps like the Trigger Systems Sapphire 34 and Fiji Cube Advanced 36 have a sockless design with a filter roller compartment. This reduces mechanical filtration maintenance while directing nutrient-rich water to the refugium.
How do I control flow to the refugium chamber? Use an adjustable gate valve or weir on the return line. The Fiji Cube Advanced 36 has a gate valve for fine-tuned flow (200–500 GPH), while the Reef Octopus Triton V2 uses an adjustable weir.
What lighting is best for a refugium sump? LED fixtures like the Kessil H80 (for small sumps) or AI Prime Fuge (for medium sumps) are popular. The Reef Savvy Sump 40 includes a built-in chaeto reactor port for external lighting.
Can I use a glass sump for a refugium? Yes, glass sumps like the Trigger Systems Sapphire 34 and Eshopps R-200 are silicone-sealed and durable. They are heavier but less prone to scratching than acrylic options.
How do I prevent detritus buildup in the refugium? Use adjustable flow (200–400 GPH) and a sockless design with a filter pad or roller. The Bashsea Bio-Fuge 30 uses marine pure blocks to trap detritus before it enters the chaeto section.
What is the best sump for a nano tank (20–40 gallons)? The Bashsea Classic 24 (4-gallon refugium) or Fiji Cube Refugium Sump 24 (5-gallon refugium) are compact options. The Eshopps R-200 (8-gallon refugium) is also suitable for nano systems.
Can I use a refugium sump with a Herbie overflow? Yes, sumps like the Reef Octopus Triton V2 and Reef Savvy Sump 40 have dual-drain inputs that support Herbie or BeanAnimal overflow setups. Ensure 1-inch bulkheads for compatibility.
How often should I clean the refugium chamber? Every 4–6 weeks, remove chaetomorpha growth and detritus from the chamber. The Trigger Systems Ruby 36 has an adjustable baffle for easy access.
What is the difference between cast acrylic and glass sumps? Cast acrylic (e.g., Reef Octopus Triton V2) is lighter and more impact-resistant, while glass (e.g., Trigger Systems Sapphire 34) is heavier but less prone to scratching. Both are suitable for refugium use.
Sources
- Reef Octopus Triton V2 Sump Specifications
- Trigger Systems Sapphire 34 Sump Details
- Fiji Cube Advanced Sump 36 Features
- Alignment Reef Shadow 34 Sump Overview
- Bashsea Bio-Fuge 30 Sump Information
- Eshopps R-200 Refugium Sump Specs
- Reef Savvy Sump 40 Custom Options
- Trigger Systems Ruby 36 Sump Details
Bottom Line
For professional reef operators, the Reef Octopus Triton V2 delivers the best refugium integration with adjustable flow, a built-in algae scrubber port, and cast acrylic durability, while the Trigger Systems Sapphire 34 offers excellent value with a sockless design and large refugium volume.
Prioritize sumps with dedicated refugium chambers, adjustable weirs, and dual-drain inputs for optimal nutrient export and pod cultivation in 2027 systems.
*Top 10 reef sump designs for refugium filtering with real brands, prices, and specs for professional operators in 2027.*